Manufacture of knitted fabrics and articles



Patented July 2, 1929.

UNITED STATES PATENT OFFICE.

CAMILLE DREYFUS; OF BASEL, SWITZERLAND, ASSIGNOR T CELANESE CORPORATION OF AMERICA, A CORPORATION OF DELAWARE.

MANUFACTURE OF KNITTED FABRICS AND ARTICLES.

No Drawing.

Fabrics and articles when .aade, for instance, on a circular knittingr. achim or on a knitting machine of circular knitting type or other knitting machine, are more or less subject to laddering, which is a very big drawback.

It has now been found that this laddering feature in fabrics and articles can be completely or partly eliminated or substantially reduced by impregnating or treating the fabric or article which ladders with a material (which material can be a gas or a solvent or a liquid or a solution of a solid in a liquid, etc.) having the effect of binding more orless threads or filaments of threads together in the fabric or article or melting more or less threads or filaments together of the fabric or article, thus creating a resistance to laddering. These substances are preferably chosen in such a composition or solution, etc., or are applied in such a way as not to interfere substantially with the texture or with the nature or appearance of the fabrics or articles so produced.

The invention can be carried out with fabrics or articles made of fibres or mixtures of fibres, such as cotton, wool, silk, artificial silks, yarns, artificial silks made from organic or inorganic derivatives of cellulose, such as cellulose acetate or others or esters of cellulose or nitro cellulose and others or from mixtures of different fibres.

En'ample #J.Knitted silk fabrics or articles of silk subject to laddering are treated with alkali or acetic acid in such a strength as to just attack the fibres slightly and melt or stick them slightly and superficially together.

Example #2.Knitted fabrics or articles made from cellulose acetate artificial silk, or from cellulose ether silk, or from other organic or inorganic derivatives of cellulose, subject to laddering, are treated with acetone (in gas form or as a liquid or with other solvents in such a diluted composition with air or with water or other diluents so as not to interfere substantially with the texture or appearance or nature of the fabric or Application filed February 23, 1924. Serial No. 694,810.

- pose of reducing tendency to ladderin'g, said process comprising treating the fabric or article with an agent having a slight solvent action on the organic derivative of cellulose fibres composing the threads, whereby the fibres and threads are caused to adhere slightly together in the knit web without substantially affecting the texture and appearance of the web.

2. Process for the treatment 'of knitted fabrics and articles composed of threads of cellulose acetate artificial silk, for the purpose of reducing tendency to laddering, said process comprising treating the fabric or article with a solvent of cellulose acetate in a dilution capable of exerting only a slight solvent action on the cellulose acetate fibres whereby the fibres and threads are caused to adhere slightly together in the knit web Without substantially affecting the texture and appearance of the web.

3. Process for the treatment of knitted fabrics and articles composed of threads of an organic derivative of cellulose, for the purpose of reducing tendency to laddering, said process comprising treating fabric or articles with a solvent of said cellulose derivative in a dilution capable of exerting only a slight solvent action on the fibres of said cellulose derivative whereby the fibres and threads are caused to adhere slightly together in the knit web without substantially, affecting the texture and appearance of the web.

4. Knitted fabrics and articles of cellulose out the web and in which the web substanacetate whose contiguous fibres adhere tially retains its orginal texture and appear- 10 slightly to each other throughout the web ance.\

and in which the web substantially retains In testimony whereof, I have hereunto 5 its original texture and appearance. subscribed my name this 21st day of Febru- 5. Knitted fabrics and articles of an ary, 1924. organic cellulose derivative Whose contiguous fibres adhere slightly to each other through- CAMILLE DREYFUS. 

